阅读说明：本技术 头部佩戴装置、中暑预防系统以及水分补充警告系统 (Head-mounted device, heatstroke prevention system, and moisture replenishment warning system ) 是由 桥元伸晃 组田良则 近藤敏仁 于 2020-03-12 设计创作，主要内容包括：本公开提供一种能够以更高的精度对推定中暑的可能性所需的、作为作业人员的佩戴者的身体状态进行测量的头部佩戴装置。头部佩戴装置,具备：外壳；第一流路,所述第一流路是佩戴者的头部和外壳之间的间隙；第二流路,设于外壳且连接到第一流路；风扇,从第一流路和第二流路的一方向另一方送风；盐分浓度传感器,用于测量佩戴者的汗的盐分浓度；第一湿度传感器,用于测量进入第一流路和第二流路的一方的吸入空气的绝对湿度；第二湿度传感器,用于测量从第一流路和第二流路的另一方排出的排出空气的绝对湿度。(Provided is a head-mounted device capable of measuring the physical state of a wearer as an operator, which is required for estimating the possibility of heatstroke, with higher accuracy. A head-mounted device is provided with: a housing; a first flow path that is a gap between a wearer's head and a housing; a second flow path provided in the housing and connected to the first flow path; a fan that blows air from one of the first flow path and the second flow path to the other; a salinity concentration sensor for measuring the salinity concentration of the wearer's sweat; a first humidity sensor for measuring an absolute humidity of the intake air entering one of the first flow path and the second flow path; and a second humidity sensor for measuring an absolute humidity of the exhaust air exhausted from the other of the first flow path and the second flow path.)

1. A head-mounted device is provided with:

a housing;

a first flow path that is a gap between a wearer's head and the housing;

a second flow path provided in the housing and connected to the first flow path;

a fan that blows air from one of the first flow path and the second flow path to the other;

a salinity concentration sensor for measuring the salinity concentration of the wearer's sweat;

a first humidity sensor for measuring an absolute humidity of the intake air entering one of the first flow path and the second flow path; and

and a second humidity sensor for measuring an absolute humidity of the exhaust air exhausted from the other of the first flow path and the second flow path.

2. The head-worn device of claim 1,

the fan blows air with an air volume that allows the temperature of the exhaust air to be equal to or higher than the dew-point temperature of the exhaust air.

3. The head-worn device of claim 1 or 2,

the first humidity sensor is located outside the housing.

4. The head-worn device of any one of claims 1 to 3,

a first humidity sensor measures the temperature and relative humidity of the intake air and is located on an interior surface of the housing.

5. The head-worn device of any one of claims 1 to 4,

the fan conveys air from the first flow path toward the second flow path and is located at a downstream-side end portion of the first flow path,

the second humidity sensor is located downstream of the fan.

6. The head-worn device of any one of claims 1 to 3,

the disclosed device is provided with: a sensor unit having: a casing, a pipe member having one end connected to the casing and the other end disposed inside the casing, the fan, the salinity concentration sensor, the first humidity sensor, and the second humidity sensor,

the duct member, the fan, the salinity concentration sensor, the first humidity sensor, and the second humidity sensor are supported by the housing.

7. The head-worn device of claim 6,

the sensor unit is detachable with respect to the housing.

8. The head-worn device of any one of claims 1 to 7,

the temperature sensor is provided for measuring the body temperature of the wearer.

9. The head-worn device of claim 8,

the body temperature sensor measures core body temperature.

10. The head-worn device of any one of claims 1 to 9,

a heart rate sensor is provided for measuring the heart rate of the wearer.

11. The head-worn device of any one of claims 1 to 10,

an environment sensor is provided for measuring the wet bulb temperature and the black bulb temperature in the periphery of the wearer.

12. The head-worn device of any one of claims 1 to 11,

the air volume measuring device is used for measuring the air volume of the fan.

13. The head-worn device of claim 12,

the air volume measuring device is an air volume sensor arranged at an inlet or an outlet of the air of the fan.

14. The head-worn device of claim 12,

the air volume measuring device includes a pressure sensor for measuring a differential pressure of the fan,

the head-mounted device includes a control device that calculates the air volume of the fan based on information obtained from the pressure sensor.

15. The head-worn device of claim 12,

the air volume measuring device includes a detection mechanism that detects a power supply voltage that drives the fan,

the head-mounted device includes a control device that calculates the air volume of the fan based on information obtained from the detection means.

16. The head-mounted device according to any one of claims 1 to 15, comprising:

a control device that calculates the amount of perspiration and the amount of salt loss of the wearer based on information obtained from the salt concentration sensor, the first humidity sensor, and the second humidity sensor; and

and an alarm device that issues an alarm when the change in the perspiration amount satisfies a predetermined condition.

17. A heatstroke prevention system is provided with:

the head-worn device and management device of any one of claims 1 to 15,

the head-mounted device is provided with: a communication device for transmitting information obtained from the salinity concentration sensor, the first humidity sensor, and the second humidity sensor by wireless communication,

the management device receives information from the communication device, and stores the amount of perspiration and salt loss of the wearer.

18. A heatstroke prevention system according to claim 17, further comprising:

and an alarm device that gives an alarm to a manager when a transition of at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

19. A heatstroke prevention system according to claim 17, wherein,

the head-mounted device is provided with: and an alarm device that gives an alarm to the wearer when a change in at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

20. A moisture replenishment warning system is provided with:

the head-worn device and management device of any one of claims 1 to 15,

the head-mounted device is provided with: a communication device for transmitting information obtained from the salinity concentration sensor, the first humidity sensor, and the second humidity sensor by wireless communication,

the management device receives information from the communication device, and stores the amount of perspiration and salt loss of the wearer.

21. The moisture replenishment warning system of claim 20,

the disclosed device is provided with: and an alarm device that gives an alarm to a manager when a transition of at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

22. The moisture replenishment warning system of claim 20,

the head-mounted device is provided with: and an alarm device that gives an alarm to the wearer when a change in at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

Technical Field

The present disclosure relates to a head-mounted device, a heatstroke prevention system, and a moisture supplement warning system.

Background

In a construction site or the like, an operator may work in a high-temperature environment. In a high-temperature environment, it is necessary to prevent heat stroke of the worker. Conventionally, there is known a device to be worn by an operator for preventing heatstroke. For example, patent document 1 describes a helmet including a temperature sensor and a humidity sensor. According to the helmet of patent document 1, since the manager can grasp the state inside the helmet, the manager can communicate with the worker when an abnormality occurs. Non-patent document 1 describes that the heat exposure needs to be stopped. Non-patent document 2 describes a symptom of heatstroke.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-115275

Non-patent document

Non-patent document 1: "preventing heatstroke", labour basis bureau of labour province in great birth, labour basis bureau of Dudaofu county, labour basis supervision administration in 2013 for 4 months

Non-patent document 2: 'prevent workplace' heatstroke ',' Tokyo Ministry of labour health class, 2 months in 2017

Disclosure of Invention

Problems to be solved by the invention

However, the helmet of patent document 1 measures only the temperature and humidity inside the helmet. Therefore, there is a limit to the physical state of the operator's wearer, which is necessary for estimating the possibility of heat stroke, such as accurate detection of the amount of in-vivo moisture and the amount of salt reduction of the operator. Therefore, it is difficult to improve the accuracy of estimation of the possibility of heatstroke.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a head-mounted device capable of measuring a physical state of a wearer as an operator, which is required to estimate a possibility of heatstroke, with higher accuracy.

Means for solving the problems

In order to achieve the above object, a head-mounted device according to one aspect of the present disclosure includes: a housing; a first flow path that is a gap between a wearer's head and the housing; a second flow path provided in the housing and connected to the first flow path; a fan that blows air from one of the first flow path and the second flow path to the other; a salinity concentration sensor for measuring the salinity concentration of the wearer's sweat; a first humidity sensor for measuring an absolute humidity of the intake air entering one of the first flow path and the second flow path; and a second humidity sensor for measuring an absolute humidity of the exhaust air exhausted from the other of the first flow path and the second flow path.

Preferably, the fan blows air with an air volume such that the temperature of the exhaust air becomes equal to or higher than the dew point temperature of the exhaust air.

Preferably, the first humidity sensor is located outside the housing.

Preferably, the first humidity sensor measures the temperature and relative humidity of the inhaled air and is located on the inner surface of the housing.

In a preferred embodiment of the head-mounted device, the fan transports air from the first flow path toward the second flow path, and is located at a downstream end of the first flow path, and the second humidity sensor is located downstream of the fan.

As a preferable aspect of the head-mounted device, a sensor unit is provided, the sensor unit including: a casing, a pipe member having one end connected to the casing and the other end disposed inside the housing, the fan, the salt concentration sensor, the first humidity sensor, and the second humidity sensor, wherein the pipe member, the fan, the salt concentration sensor, the first humidity sensor, and the second humidity sensor are supported by the casing.

Preferably, the sensor unit is detachable from the housing.

Preferably, the head-mounted device includes a body temperature sensor for measuring a body temperature of the wearer.

Preferably, the body temperature sensor measures a core body temperature.

Preferably, the head-mounted device includes a heart rate sensor for measuring a heart rate of the wearer.

Preferably, the head-mounted device includes an environment sensor for measuring a wet bulb temperature and a black bulb temperature around the wearer.

Preferably, the head-mounted device includes an air volume measuring device for measuring an air volume of the fan.

Preferably, the air volume measuring device is an air volume sensor provided at an inlet or an outlet of air of the fan.

Preferably, the air volume measuring device includes a pressure sensor for measuring a differential pressure of the fan, and the head-mounted device includes a control device for calculating the air volume of the fan based on information obtained from the pressure sensor.

Preferably, the air volume measuring device includes a detection unit that detects a power supply voltage for driving the fan, and the head-mounted device includes a control device that calculates the air volume of the fan based on information obtained from the detection unit.

A preferred embodiment of the head-mounted device includes: a control device that calculates the amount of perspiration and the amount of salt loss of the wearer based on information obtained from the salt concentration sensor, the first humidity sensor, and the second humidity sensor; and an alarm device that issues an alarm when the transition of the perspiration amount satisfies a predetermined condition.

A heatstroke prevention system according to an aspect of the present disclosure includes: in the above-described head-mounted device and management device, the head-mounted device includes a communication device that transmits information obtained from the salinity concentration sensor, the first humidity sensor, and the second humidity sensor by wireless communication, and the management device receives the information from the communication device and stores the perspiration amount and the salinity loss amount of the wearer.

A preferable example of the heatstroke prevention system includes an alarm device that gives an alarm to a manager when at least one of the sweat amount and the salt loss amount has changed to satisfy a predetermined condition.

In a preferable aspect of the heatstroke prevention system, the head-mounted device includes an alarm device that gives an alarm to the wearer when a change in at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

The moisture supplement warning system according to an aspect of the present disclosure includes the head-worn device described above, which includes a communication device that transmits information obtained from the salinity concentration sensor, the first humidity sensor, and the second humidity sensor by wireless communication, and a management device that receives the information from the communication device and stores the perspiration amount and the salinity loss amount of the wearer.

Preferably, the moisture replenishment warning system includes a warning device for giving a warning to a manager when a transition of at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

Preferably, the head-mounted device includes an alarm device that gives an alarm to the wearer when a change in at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

Effects of the invention

According to the present disclosure, it is possible to provide a head-mounted device capable of measuring the physical state of a wearer, which is a worker and is required to estimate the possibility of heatstroke, with higher accuracy.

Drawings

Fig. 1 is a schematic view of a heatstroke prevention system according to an embodiment.

Fig. 2 is a top view of the head mounted device of the embodiment.

Fig. 3 is a sectional view a-a in fig. 2.

Fig. 4 is a sectional view B-B in fig. 2.

Fig. 5 is a graph showing the experimental results of comparing the perspiration amount calculated by the control device with the actually measured perspiration amount.

Fig. 6 is a schematic cross-sectional view showing a modification of the head mounted device.

Detailed Description

Hereinafter, the detailed description will be given with reference to the drawings of the present disclosure. The present application is not limited to the embodiment for carrying out the present application (hereinafter, referred to as "embodiment"). The constituent elements in the following embodiments include substantially the same elements, i.e., elements within the equivalent range, which can be easily conceived by those skilled in the art. Further, the constituent elements disclosed in the following embodiments can be appropriately combined.

(embodiment mode)

Fig. 1 is a schematic view of a heatstroke prevention system according to an embodiment. Fig. 2 is a top view of the head mounted device of the embodiment. Fig. 3 is a sectional view a-a in fig. 2. Fig. 4 is a sectional view B-B in fig. 2.

The heatstroke prevention system 1 of the present embodiment is a system for suppressing the occurrence of heatstroke of an operator. The heatstroke prevention system 1 is suitable for, for example, an operator at a construction site or the like. The heatstroke prevention system 1 is also a moisture replenishment warning system 1 that warns the operator that moisture should be replenished, instructs the operator to replenish moisture, or urges or instructs the operator to take a rest. As shown in fig. 1, the heatstroke prevention system 1 includes a head-mounted device 10 and a management unit 9.

The head mounted device 10 is a device to be mounted on the head of a worker. In the following description, a person wearing the head mounted device 10 will be referred to as a wearer. For example, the head mounted device 10 of the present embodiment is a helmet. As shown in fig. 1 to 4, the head mounted device 10 includes: the air conditioner includes an inner casing 3, an outer casing 2, a spacer 40, a fan 6, a battery 16, a first flow path 41, a second flow path 421, a second flow path 422, a second flow path 423, a second flow path 424, a first humidity sensor 52, a second humidity sensor 54, an air volume sensor 56, an environmental sensor 58, a salt concentration sensor 72, a body temperature sensor 74, a heart rate sensor 76, a control device 11, an alarm device 12, a communication device 13, and an antenna 14. In the following description, the second flow path 42 will be described when it is not necessary to distinguish the second flow path 421, the second flow path 422, the second flow path 423, and the second flow path 424 from each other.

As shown in fig. 3, the inner shell 3 is a member facing the head of the wearer. The inner case 3 is formed of, for example, synthetic resin or cloth. The inner shell 3 has a plurality of gaps, covering a portion of the head of the wearer. Sweat generated on the head of the wearer becomes water vapor and passes through the inner casing 3 without being blocked by the inner casing 3. It should be noted that the inner casing 3 may cover the entire head portion, but in this case, the inner casing 3 is formed of a material having moisture permeability.

As shown in fig. 3, the outer case 2 is a member covering the inner case 3, and has a hemispherical shape. The housing 2 includes a main body 20, a visor 21, and a cushioning material 25. The main body 20 is formed of, for example, synthetic resin. The visor 21 is formed integrally with the main body 20 and protrudes from the lower end portion 201 of the main body 20 in a direction away from the wearer. The cushioning material 25 is mounted to the inner surface 202 of the body 20. The inner surface of the cushioning material 25 faces the inner casing 3. The cushioning material 25 is formed of, for example, foamed styrene. The cushioning material 25 is preferably formed of a material having independent air bubbles. Thereby, the water vapor is suppressed from passing through the cushioning material 25. In the following description, an outer region is defined as an outer portion E with respect to a substantially hemispherical region surrounded by the housing 2.

As shown in fig. 2 to 4, the cushioning material 25 includes a concave portion 250, a concave portion 251, a concave portion 252, a concave portion 253, and a concave portion 254. The concave portion 250 is a hole provided on the inner surface of the cushioning material 25. The concave portions 251, 252, 253, and 254 are grooves provided on the outer surface of the cushioning material 25, and extend from the concave portion 250 to the end portion side of the main body 20 along the main body 20.

As shown in fig. 3, the spacer 40 is disposed between the inner casing 3 and the outer casing 2. More specifically, the spacer 40 is sandwiched between the inner casing 3 and the cushioning material 25. Therefore, a gap exists between the inner casing 3 and the cushioning material 25.

As shown in fig. 3, the fan 6 is provided in the housing 2. The fan 6 is disposed in the recess 250 of the cushioning material 25. For example, in the present embodiment, the fan 6 is located on the air guide body 20 side closer to the inner case 3 side than the cushioning material 25, for example. That is, the fan 6 moves air from the bottom to the top. The air volume of the fan 6 is measured by the air volume sensor 56. The fan 6 may be adjusted manually or by a control circuit included in the control device 11 described later so that the air volume becomes a predetermined value. The fan 6 is adjusted to blow air with an air volume such that the temperature of the exhaust air discharged from the second flow path 42 becomes equal to or higher than the dew point temperature of the exhaust air. That is, the fan 6 is adjusted to blow air with an air volume such that condensation does not occur at a portion around the discharged air. The minimum air volume of the fan 6 is preferably an air volume that allows the discharged air to reach a dew point temperature or higher. This is because the humidity sensor cannot generally measure the humidity of air having a relative humidity higher than 100% (the humidity of air below the dew point temperature). In order to keep the relative humidity of the exhaust air at 100% or less, the control device 11 may increase the air volume of the fan 6 so that the temperature measured by the second humidity sensor 54 described later becomes equal to or higher than the dew point temperature. In the case of use in an environment where the relative humidity of the exhaust air does not reach 100% (i.e., an environment where condensation does not occur in a portion around the exhaust air), which is a general working environment, even if the air volume of the fan 6 is simply manually set to a preferred air volume in accordance with the resistance of the wearer to summer heat and the perspiration volume, the exhaust air is at the dew point or more. Therefore, the second humidity sensor 54 described later can measure accurate absolute humidity. The minimum air volume of the fan 6 is preferably 0.01L/min or more for exchanging air on the surface of the second humidity sensor 54. The air volume of the fan 6 is more preferably 0.01L/min to 500L/min.

The battery 16 supplies power to the fan 6, the first humidity sensor 52, the second humidity sensor 54, the body temperature sensor 74, the heart rate sensor 76, the environmental sensor 58, the control device 11, the alarm device 12, the communication device 13, and the antenna 14. The control device 11, the alarm device 12, the communication device 13, and the antenna 14 may be formed on an integrated substrate.

As shown in fig. 3, the first flow path 41 is a gap between the head of the wearer and the cushioning material 25. The lower end of the first flow path 41 is connected to the outside E. The upper end of the first flow path 41 is connected to the concave portion 250 of the buffer material 25. Therefore, the fan 6 is located at the upper end of the first flow path 41. That is, the fan 6 is located at the downstream end of the first flow path 41.

As shown in fig. 2 to 4, the second flow path 42 is a flow path provided in the casing 2. The second flow path 421 is a gap between the main body 20 and the concave portion 251 of the cushioning material 25. The second flow path 422 is a gap between the body 20 and the recess 252. The second flow path 423 is a gap between the main body 20 and the recess 253. The second flow path 424 is a gap between the body 20 and the recess 254. The lower end of the second flow path 42 is connected to the outside E. The upper end of the second flow path 42 is connected to the concave portion 250 of the buffer material 25. Thus, the first flow path 41 is connected to the second flow path 42 via the recess 250.

The fan 6 sends air from the first flow path 41 to the second flow path 42. The air enters the first flow path 41 from the outside E and is discharged to the outside E from the second flow path 42. When the wearer sweats, water vapor is supplied to the first flow path 41. The air of the first flow path 41 containing the water vapor generated from the sweat is discharged to the outside E through the second flow path 42.

The first humidity sensor 52 is a sensor for measuring the absolute humidity (hereinafter referred to as a first absolute humidity) of the intake air entering the first flow path 41. Absolute humidity is the amount of water vapor contained per unit volume of air. As shown in fig. 3, the first humidity sensor 52 is located at the outside E. For example, the first humidity sensor 52 is mounted to the inner surface 211 (lower side surface) of the visor 21. The first humidity sensor 52 measures the temperature and the relative humidity of the air of the outside E.

The second humidity sensor 54 is a sensor for measuring the absolute humidity of the exhaust air discharged from the second flow path 42 (hereinafter referred to as a second absolute humidity). As shown in fig. 3, a second humidity sensor 54 is located in the second flow path 42. That is, the second humidity sensor 54 is located downstream of the fan 6. For example, the second humidity sensor 54 is mounted to the inner surface 202 of the main body 20 facing the second flow path 421. The second humidity sensor 54 measures the temperature and relative humidity of the air within the second flow path 421.

The air volume sensor 56 is a sensor for measuring the air volume of the fan 6. As shown in fig. 3, the air quantity sensor 56 is mounted to the air outlet of the fan 6. The air volume sensor 56 may also be mounted to the air inlet of the fan 6. The air volume measuring device that measures the air volume of the fan 6 is not limited to the air volume sensor 56. The air volume measuring device may also include a pressure sensor for measuring the differential pressure of the fan 6. The air volume of the fan 6 is calculated by a control device 11 described later based on information obtained from the pressure sensor. The air volume measuring device may also include a detection mechanism that detects the power supply voltage that drives the fan 6. The air volume of the fan 6 is calculated by a control device 11 described later based on information obtained from the detection means.

The environmental sensors 58 are sensors that measure the wet bulb temperature, the dry bulb temperature, and the black bulb temperature around the wearer. As shown in fig. 1, the environmental sensor 58 is mounted to the outer surface of the housing 2.

The salinity concentration sensor 72 is a sensor for measuring the salinity concentration of sweat of the wearer. As shown in fig. 3, the salt concentration sensor 72 is mounted on the inner surface of the inner casing 3. The salinity sensor 72 is in contact with the wearer. The salt concentration sensor 72 is preferably in contact with the skin of the wearer. The salinity concentration sensor 72 is more preferably mounted in contact with the forehead of the wearer.

The body temperature sensor 74 is a sensor that measures the body temperature of the wearer. As shown in fig. 3, a body temperature sensor 74 is mounted to the inner surface of the inner case 3. The body temperature sensor 74 is in contact with the wearer. Further, the body temperature sensor 74 is more preferably capable of measuring the core body temperature of the wearer. The deep body temperature index includes oral cavity temperature, rectal temperature, and tympanic membrane temperature. In the case where the body temperature sensor 74 measures the core body temperature, the mounting position of the body temperature sensor 74 is appropriately adjusted.

The heart rate sensor 76 is a sensor that measures the heart rate of the wearer. As shown in fig. 3, a heart rate sensor 76 is mounted to the inner surface of the inner shell 3. The heart rate sensor 76 is in contact with the wearer. The heart rate sensor 76 is preferably in contact with the temporal region of the wearer.

The control device 11 is a computer, and includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input interface, and an output interface. The controller 11 is electrically connected to the first humidity sensor 52, the second humidity sensor 54, the air volume sensor 56, the salt concentration sensor 72, the body temperature sensor 74, the heart rate sensor 76, and the environmental sensor 58, and receives measurement values. The controller 11 calculates medical parameters based on information obtained from the respective sensors. For example, the control device 11 calculates the amount of perspiration as the medical parameter. The control device 11 preferably calculates the variation in perspiration amount, the variation in core body temperature, the heartbeat interval, and the like. Preferably, the control device 11 indexes the risk of heatstroke of the work environment and the individual wearer based on the information obtained from the sensors and the calculated medical parameters, and controls the alarm device 12 or the communication device 13 based on the indexes. The control device 11 may be electrically connected to the fan 6 to control the air volume of the fan 6. As shown in fig. 1, the controller 11 is mounted to the inner surface 211 of the visor 21.

The control device 11 stores information on the wearer, such as the weight, age, work place, and work procedure of the wearer. For example, the control device 11 can obtain information about the wearer stored in the management device 91 described later via the communication device 13. Alternatively, the information on the wearer may be directly input to the control device 11 before the work.

The control device 11 calculates the first absolute humidity based on the temperature and the relative humidity of the intake air received from the first humidity sensor 52. There are various approximate equations for estimating the absolute humidity from the relative humidity, and here, the absolute humidity is estimated by a relatively common Tetens equation, and the first absolute humidity is X [ g/m ]³]Let the temperature of the intake air be t_A[K]RH is the relative humidity of the intake air_A[％]Setting the saturated vapor pressure of the sucked air as e_A[hPa]In the case of (3), the control device 11 obtains X from the following equations (1) and (2).

[ numerical formula 1]

[ numerical formula 2]

The controller 11 calculates the mass of the moisture entering the first flow path 41 per unit time based on the first absolute humidity (X) and the air volume of the fan 6 received from the air volume sensor 56. The mass of the water entering the first flow path 41 per unit time is defined as A [ g/min ]]The air volume of the fan 6 is V [ m ]³/min]In the case of (3), the controller 11 obtains a from the following equation (3).

[ numerical formula 3]

A＝XV...(3)

The control device 11 calculates the second absolute humidity based on the temperature and the relative humidity of the exhaust air received from the second humidity sensor 54. Setting the second absolute humidity as Y g/m³]Let the temperature of the exhaust air be t_B[K]RH is the relative humidity of the discharged air_B[％]Saturation of the exhaust airWater vapor pressure is set as e_B[hPa]In the case of (3), the control device 11 obtains Y from the following equations (4) and (5).

[ numerical formula 4]

[ numerical formula 5]

The controller 11 calculates the sum of the masses of the moisture discharged from the second flow path 421, the second flow path 422, the second flow path 423, and the second flow path 424 per unit time based on the second absolute humidity (Y) and the air volume of the fan 6. When the sum of the masses of the water contents is B [ g/min ], the controller 11 obtains B from the following equation (6).

[ numerical formula 6]

B＝YV...(6)

When the mass of moisture evaporated from the head of the wearer per unit time is C [ g/min ], the controller 11 obtains C from the following equation (7). In the following description, the mass (C) of moisture evaporated from the head of the wearer per unit time is referred to as the amount of perspiration.

[ number formula 7]

C＝B-A...(7)

Fig. 5 is a graph showing the experimental results of comparing the perspiration amount calculated by the control device with the actually measured perspiration amount. The experiment in which the control device 11 compares the perspiration amount calculated by the above-described method with the actually measured perspiration amount is performed using a device (manikin head) simulating the head of a human. The vertical axis of fig. 5 represents the cumulative value [ g ] of the perspiration amount. The solid line in fig. 5 represents the transition of the integrated value (calculated value) of the perspiration amount calculated by the control device 11. The broken line in fig. 5 indicates the transition of the integrated value (measured value) of the actually measured perspiration amount. The actually measured perspiration amount is the perspiration amount measured using an electronic balance. As shown in fig. 5, the deviation between the calculated value and the measured value is small. The control device 11 can calculate the perspiration amount with high accuracy. In order for the control device 11 to calculate the amount of perspiration with high accuracy, it is desirable to increase the accuracy of the air volume of the fan 6 and reduce the noise of each sensor. Fig. 5 shows the cumulative amount of perspiration on a time basis, but the amount of perspiration per unit time may also be displayed. In this way, it is possible to determine the sign of high possibility of heatstroke from an abnormal value such as an abnormal increase in the amount of perspiration after a certain time.

The control device 11 calculates and stores the perspiration amount at predetermined intervals. The control device 11 determines whether or not the wearer is likely to suffer heat stroke based on the transition of the perspiration amount. When the change in the perspiration amount satisfies the predetermined condition, the control device 11 determines that the wearer is likely to suffer heat stroke. For example, the control device 11 stores a threshold value predetermined in relation to the perspiration amount, and determines that the wearer is likely to suffer heat stroke when the perspiration amount exceeds the threshold value. Alternatively, the control device 11 stores a threshold value and a threshold number that are predetermined in relation to the amount of perspiration, and determines that the wearer is likely to suffer a heat stroke when the number of times the amount of perspiration exceeds the threshold number.

Alternatively, the control device 11 integrates the amount of perspiration, and determines that the wearer is likely to suffer heat when the integrated amount of perspiration exceeds a threshold value. The threshold value in this case is, for example, a mass corresponding to 1.5% of the body weight of the wearer (see non-patent document 1). The weight loss of the wearer can be measured in terms of the amount of perspiration of the wearer's whole body. In order to prevent heatstroke, a value smaller than the threshold value is preferably set as the threshold value. The control device 11 can calculate the perspiration amount of the head, but can estimate the whole-body perspiration amount (the amount of reduction in body weight) from the perspiration amount of the head by previously storing the relationship between the perspiration amount of the head and the perspiration amount of the whole body. Alternatively, the control device 11 stores a threshold value relating to the amount of perspiration accumulated over a predetermined period of time, and determines that the wearer is likely to suffer a heat stroke when the amount of perspiration accumulated over the predetermined period of time exceeds the threshold value. Alternatively, the control device 11 stores a first threshold value relating to the amount of perspiration accumulated over a predetermined period of time and a second threshold value relating to the wet bulb temperature (or dry bulb temperature) around the wearer, and determines the possibility of heatstroke for the wearer based on the first threshold value and the second threshold value. For example, in a case where the wet bulb temperature exceeds the second threshold value and the amount of perspiration accumulated over a predetermined time is lower than the first threshold value, the control device 11 determines that the wearer is likely to suffer heat stroke.

When the change in the perspiration amount satisfies a predetermined condition, the control device 11 determines that the wearer should be replenished with water. For example, the control device 11 stores a threshold value predetermined in relation to the total perspiration amount, and determines that the wearer should be replenished with moisture when the total perspiration amount exceeds the threshold value. The control device 11 calculates the amount of moisture that the wearer should replenish, based on the information on the amount of perspiration. For example, the amount of moisture that the wearer should replenish, which is calculated by the control device 11, is an amount of moisture corresponding to the amount of perspiration all over the body. The amount of moisture to be supplied to the wearer calculated by the control device 11 may be an amount different from the amount of moisture corresponding to the amount of perspiration all over the body.

The control device 11 calculates the amount of salt loss contained in the sweat evaporated from the head of the wearer per unit time based on the sweat amount and the salt concentration of the sweat received from the salt concentration sensor 72. The controller 11 calculates and stores the salt loss amount at predetermined intervals. The controller 11 determines whether or not the wearer is likely to suffer heat stroke based on the transition of the salt loss amount. When the change in the salt loss amount satisfies a predetermined condition, the controller 11 determines that the wearer is likely to suffer a heat stroke. For example, the controller 11 stores a threshold value predetermined in relation to the salt loss amount, and determines that the wearer has a possibility of heatstroke when the salt loss amount exceeds the threshold value. Alternatively, the controller 11 stores a threshold value and a threshold number predetermined in relation to the salt loss amount, and determines that the wearer is likely to suffer a heatstroke when the number of times the salt loss amount exceeds the threshold number. The control means 11 may also store the average salt concentration of the sweat. The control device 11 may also calculate the amount of salt loss of the wearer based on the average salt concentration of sweat. The average salt concentration of sweat is a predetermined value stored in the control device 11 in advance. The average salt concentration of sweat may be determined by measuring the salt concentration of sweat a predetermined number of times for each wearer and calculating the average value thereof, or may be determined by using a value of a generally known salt concentration of sweat without providing the salt concentration sensor 72. The average salt concentration of the typical known sweat is 0.3% to 0.4%.

The control device 11 determines whether or not the wearer is likely to suffer heat stroke based on the change in body temperature. For example, when the body temperature received from the body temperature sensor 74 during rest of the wearer does not return to the body temperature before the start of the work, the control device 11 determines that the wearer may suffer a heat stroke (see non-patent document 1).

The control device 11 determines whether or not the wearer is likely to suffer a heat stroke based on the transition of the heart rate. For example, when the number of heartbeats per 1 minute exceeds a value obtained by subtracting the age of the wearer from 180 and continues for several minutes, the controller 11 determines that there is a possibility of heatstroke for the wearer. Alternatively, if the number of heartbeats 1 minute after 1 minute from the peak of the work intensity of the wearer exceeds 120, the control device 11 determines that there is a possibility of heatstroke for the wearer (see non-patent document 1).

The controller 11 calculates a summer heat index (WBGT) based on the information measured by the environment sensor 58. Since the control device 11 stores the work procedure of the wearer, it is grasped whether the wearer is outdoors or indoors. In the case where the wearer is outdoors, the control device 11 calculates the summer-heat index based on the wet bulb temperature, the dry bulb temperature, and the black bulb temperature. In the case where the wearer is indoors, the control device 11 calculates the summer heat index based on the wet bulb temperature and the black bulb temperature. The control device 11 can also use the summer heat index in determining whether the wearer is likely to suffer a heat stroke.

The control device 11 may also determine whether the wearer is likely to suffer a heat stroke by combining information obtained from the salinity sensor 72, the body temperature sensor 74, the heart rate sensor 76, and the environment sensor 58 with the perspiration amount.

The alarm device 12 is a device for making the wearer recognize that there is a possibility of heatstroke. As shown in FIG. 1, the warning device 12 is mounted to an inner surface 211 of the visor 21. When the control device 11 determines that there is a possibility of heatstroke for the wearer, the alarm device 12 issues an alarm. The kind of the alarm is not particularly limited. Examples of the alarm include sound, light, and vibration. The alarm device 12 is a device for recognizing that at least one of moisture replenishment and salt replenishment is required. The alarm device 12 issues an alarm when the control device 11 determines that the wearer should be replenished with at least one of water and salt. The kind of the alarm is not particularly limited. Examples of the alarm include sound, light, and vibration. For example, when the controller 11 determines that the wearer should be replenished with at least one of moisture and salt, the alarm 12 displays the amount of at least one of moisture and salt that the controller 11 calculates and that the wearer should be replenished with. For example, when the control device 11 determines that the wearer should be replenished with at least one of moisture and salt, the alarm device 12 instructs the wearer by sound or the like to take up at least one of the moisture and salt in an amount calculated by the control device 11 that the wearer should be replenished. In addition, the alarm device 12 may use at least one of the indication of moisture replenishment and salt replenishment and the indication of a break urging based on, for example, a continuous operation time.

The communication device 13 and the antenna 14 are devices for transmitting information obtained by the control device 11 to the management unit 9. As shown in fig. 1, the communication device 13 is mounted to the inner surface 211 of the visor 21. As shown in fig. 1, the antenna 14 is mounted to the outer surface of the visor 21.

The management unit 9 is a place where a manager who monitors the wearer is located. As shown in fig. 1, the management unit 9 includes a management device 91 and an alarm device 92. The management device 91 receives information from the plurality of head mounted devices 10. The management device 91 stores information such as work places, work procedures, and ages of a plurality of wearers.

The management device 91 stores the perspiration amount, the salt loss amount, and the information obtained from the sensors, which are obtained from the control device 11. The management device 91 determines whether or not the wearer is likely to suffer heatstroke based on the amount of perspiration, the amount of salt loss, the body temperature, the heart rate, and the transition of the summer-heat index. The management device 91 determines whether or not the wearer should supply at least one of moisture and salt based on the progress of the perspiration amount, the salt loss amount, the body temperature, the heart rate, and the summer heat index. The specific determination method may be the same as or different from the determination method of the control device 11.

The alarm device 92 is a device for making the manager recognize that the wearer is likely to suffer a heat stroke. When the management device 91 determines that there is a possibility of heatstroke for the wearer, the alarm device 92 issues an alarm to the manager. The alarm device 92 is a device for allowing the manager to recognize that the wearer should be replenished with at least one of moisture and salt. When the management device 91 determines that the wearer should be replenished with at least one of water and salt, the alarm device 92 gives an alarm to the manager. The type of alarm is not particularly limited, as in the alarm device 12. In addition, the alarm device 92 may use at least one of the indication of moisture replenishment and salt replenishment and the indication of a break urging based on the continuous operation time, for example, in combination.

The materials of the inner casing 3 and the outer casing 2 are only an example, and are not particularly limited. Further, the head mounted device 10 may not necessarily have the inner case 3. For example, by the spacer 40 being in contact with the head, a gap may be formed between the housing 2 and the head.

In the head mounted device 10, the air of the outside E may not necessarily enter from the first flow path 41. The air of the outside E may enter from the second flow path 42 and be discharged from the first flow path 41. In this case, the second humidity sensor 54 is preferably disposed near the outlet of the first flow path 41.

Air can also flow out or in through holes that open onto the outer surface of the housing 2. When air flows out from a hole opened in the outer surface of the housing 2, the second humidity sensor 54 may be disposed at the hole. When air flows in from a hole opened in the outer surface of the housing 2, the second humidity sensor 54 may be disposed, for example, at the lower end of the first flow path 41. The first humidity sensor 52 may be disposed on the inner surface 211 of the visor 21, or may be disposed at a hole opened in the outer surface of the housing 2 when air flows in through the hole. When air flows out of or into the hole opened in the outer surface of the housing 2 in this manner, the hole serves as a second flow path.

The number of the second humidity sensors 54 provided to the head mounted device 10 does not have to be one. For example, second humidity sensor 54 may be disposed in second flow path 421, second flow path 422, second flow path 423, and second flow path 424, respectively. In this case, the control device 11 preferably calculates the perspiration amount based on an average value of the measurement results of the plurality of second humidity sensors 54.

The head mounted device 10 may not necessarily have a plurality of second flow paths 42 as long as there is at least one second flow path 42. That is, the head mounted device 10 may have at least one of the second flow path 421, the second flow path 422, the second flow path 423, and the second flow path 424.

In the case where the air volume of the fan 6 is automatically adjusted by the control device 11, the control device 11 may increase the air volume of the fan 6 in the case where the temperature of the discharged air is less than the dew point temperature. Further, the control device 11 may increase the air volume of the fan 6 as the amount of perspiration increases. The fan 6 may send air from the second flow path 42 to the first flow path 41.

The head mounted device 10 may not include the air volume sensor 56, the body temperature sensor 74, the heart rate sensor 76, and the environment sensor 58. The head mounted device 10 may include a pressure sensor for measuring a differential pressure of the fan 6 or a detection means for detecting a power supply voltage for driving the fan 6, instead of the air volume sensor 56. The head mounted device 10 may measure the air volume of the fan 6 in any manner as long as the air volume can be measured. In the present embodiment, the head mounted device 10 sets the set value of the air volume set by the control device 11 and the air volume of the measurement value measured by the air volume measuring device to V [ m [ ]³/min]However, the set value of the air volume set by the control device 11 may be V [ m ]³/min]. That is, the head mounted device 10 may not measure the air volume of the fan 6. The head mounted device 10 has only to have at least the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54 as sensors. Further, the first humidity sensor 52 and the second humidity sensor 54 may not necessarily be sensors that measure temperature and relative humidity, as long as they can measure absolute humidity. For example, the first humidity sensor 52 and the second humidity sensor 54 may be moisture meters (infrared moisture meters) using light (near infrared rays). The water has specific wavelength of absorptionThe nature of the near infrared light. The infrared moisture meter measures absolute humidity based on the magnitude of absorbance. The first humidity sensor 52 may not necessarily be disposed on the inner surface 211, and may be disposed on the inner surface of the buffer material 25. When the fan 6 blows air from the second flow path 42 to the first flow path 41, the first humidity sensor 52 may be disposed on the inner surface 202. In this case, the second humidity sensor 54 is disposed on the inner surface of the buffer material 25, for example.

The head mounted device 10 may include a sensor other than the above-described sensor. For example, the head mounted device 10 may be provided with a cerebral blood flow sensor that measures the cerebral blood flow of the wearer. As a cerebral blood flow sensor, an apparatus for non-invasively measuring brain functions from the scalp using near infrared rays is known. This device is called Near infrared Spectroscopy (NIRS) brain measurement device. The head mounted device 10 may also include an acceleration sensor. Thereby, the head mounted device 10 can detect dizziness and the like of the wearer.

The head mounted device 10 may not include the communication device 13 and the antenna 14. Even in such a case, since the head mounted device 10 has the alarm device 12, the wearer can recognize that there is a possibility of heat stroke.

The head mounted device 10 may not include the control device 11. In this case, the information measured by the first humidity sensor 52, the second humidity sensor 54, the air volume sensor 56, the salinity sensor 72, the body temperature sensor 74, the heart rate sensor 76, and the environmental sensor 58 is transmitted to the management apparatus 91 via the communication apparatus 13. Then, the management device 91 calculates the perspiration amount based on the above equations (1) to (7), and determines whether or not the wearer is likely to suffer heat stroke. Even when the head mounted device 10 includes the control device 11, the sweat amount can be calculated by the management device 91.

The control device 11 and the management device 91 may accumulate information measured by each sensor in the past and change the criterion for determining whether or not there is a possibility of heatstroke based on the information. Furthermore, the control device 11 and the management device 91 may also have Artificial Intelligence (AI). By learning the accumulated information with artificial intelligence, the accuracy of determining whether or not there is a possibility of heatstroke can be improved.

The head mounted device 10 may not include the alarm device 12. The management unit 9 may not include the alarm device 92. However, the heatstroke prevention system 1 preferably has at least one of the alarm device 12 and the alarm device 92.

As described above, the head mounted device 10 includes the housing 2, the first flow path 41, the second flow path 42, the fan 6, the salt concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54. The first flow path 41 is a gap between the head of the wearer and the housing 2. The second flow path 42 is provided in the housing 2 and connected to the first flow path 41. The fan 6 blows air from one of the first flow path 41 and the second flow path 42 to the other. The salinity concentration sensor 72 is a device for measuring the salinity concentration of sweat of the wearer. The first humidity sensor 52 is a device for measuring the absolute humidity of the intake air that enters one of the first flow path 41 and the second flow path 42. The second humidity sensor 54 is a device for measuring the absolute humidity of the exhaust air discharged from the other of the first flow path 41 and the second flow path 42.

Thus, the head mounted device 10 can obtain the sweat content and the salt loss amount of the head of the wearer based on the information obtained from the salt concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54. As a result, the head mounted device 10 can measure the physical state of the wearer, which is a worker required to estimate the possibility of heatstroke, with higher accuracy.

In the head-mounted device 10, the fan 6 blows air with an air volume such that the temperature of the exhaust air becomes equal to or higher than the dew point temperature of the exhaust air.

Thus, the relative humidity of the exhaust air is less than 100%. Condensation caused by moisture contained in the discharged air is suppressed. Therefore, the accuracy of the absolute humidity obtained by the second humidity sensor 54 is improved. As a result, the head mounted device 10 can improve the measurement accuracy of the perspiration amount.

Further, in the head mounted device 10, the first humidity sensor 52 is located at the outside E of the housing 2.

Thus, the first humidity sensor 52 is less susceptible to water vapor caused by the wearer's perspiration. Therefore, the accuracy of the absolute humidity obtained by the first humidity sensor 52 is improved.

Further, in the head mounted device 10, the first humidity sensor 52 measures the temperature and relative humidity of the intake air, and is located at the inner surface (e.g., the inner surface 211) of the casing 2.

Thus, since the housing 2 blocks sunlight, the first humidity sensor 52 is not easily irradiated with sunlight. Since the temperature of the intake air measured by the first humidity sensor 52 becomes less likely to cause an error, the accuracy of the absolute humidity obtained by the first humidity sensor 52 is improved.

In the head mounted device 10, the fan 6 sends air from the first flow path 41 to the second flow path 42, and is positioned at the downstream end of the first flow path 41. A second humidity sensor 54 is located downstream of the fan 6.

Thus, since the air containing the water vapor generated from the sweat is stirred by the fan 6, the distribution of the absolute humidity is easily made uniform downstream of the fan 6. In addition, in the case where a plurality of second flow paths 42 exist, the difference in absolute humidity between the second flow paths 42 is suppressed. Therefore, the accuracy of the absolute humidity obtained by the second humidity sensor 54 is improved.

The head mounted device 10 is further provided with a body temperature sensor 74 that measures the body temperature of the wearer. Thereby, the head mounted device 10 can measure the physical state of the wearer with higher accuracy.

Further, in the head mounted device 10, the body temperature sensor 74 measures the core body temperature. Thereby, the head mounted device 10 can measure the physical state of the wearer with higher accuracy.

The head mounted device 10 is further provided with a heart rate sensor 76 that measures the heart rate of the wearer. Thereby, the head mounted device 10 can measure the physical state of the wearer with higher accuracy.

Further, the head mounted device 10 is provided with an environment sensor 58 that measures the wet bulb temperature and the black bulb temperature around the wearer. Thereby, the head mounted device 10 can measure the physical state of the wearer with higher accuracy.

The head mounted device 10 is also provided with an air volume measuring device for measuring the air volume of the fan 6. This enables correction of the air volume based on real-time measurement. Since the perspiration amount of the wearer's head can be calculated based on the more accurate air volume value, the perspiration amount of the wearer's head can be obtained more appropriately. As a result, the head mounted device 10 can measure the physical state of the wearer, which is a worker required to estimate the possibility of heatstroke, with higher accuracy.

In the head-mounted device 10, the air volume measuring device is an air volume sensor 56 provided at an inlet or an outlet of air of the fan 6. This makes it possible to easily measure the air volume of the fan 6.

The head-mounted device 10 may include a pressure sensor that measures a differential pressure of the fan 6 instead of the air volume sensor 56, and the control device 11 that calculates the air volume of the fan 6 based on information obtained from the pressure sensor. This makes it possible to easily measure the air volume of the fan 6.

The head-mounted device 10 may include, instead of the air volume sensor 56, a detection means for detecting a power supply voltage for driving the fan 6, and the control device 11 for calculating the air volume of the fan 6 based on information obtained from the detection means. This makes it possible to easily measure the air volume of the fan 6.

The head mounted device 10 includes a control device 11 and an alarm device 12. The controller 11 calculates the sweat amount and the salt loss amount of the wearer based on the information obtained from the salt concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54. The alarm device 12 issues an alarm when the change in the perspiration amount satisfies a predetermined condition.

Since a large amount of perspiration is an initial symptom of heatstroke (see non-patent document 2), the head mounted device 10 can detect whether or not the wearer has an initial symptom of heatstroke. That is, the head mounted device 10 can detect a heatstroke at an early stage. The head mounted device 10 can improve accuracy of estimation of the possibility of heatstroke. By the alarm device 12, the wearer can recognize that there is a possibility of heatstroke at an early stage. Therefore, the head mounted device 10 can suppress the severity of heatstroke.

The heatstroke prevention system 1 further includes a head-mounted device 10 and a management device 91. The head-mounted device 10 includes a communication device 13 that transmits information obtained from the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54 by wireless communication. The management device 91 receives information from the communication device 13, and stores the perspiration amount and the salt loss amount of the wearer.

Thus, the management device 91 can detect whether or not the wearer located at a remote place has an initial symptom of heatstroke. That is, the heatstroke prevention system 1 can detect heatstroke at an early stage. The heatstroke prevention system 1 can improve accuracy of estimation of the possibility of heatstroke. The manager can recognize that the wearer has a possibility of heatstroke through the management apparatus 91. Therefore, the heatstroke prevention system 1 can suppress the severity of heatstroke.

The heatstroke prevention system 1 further includes an alarm device 92 configured to give an alarm to the manager when at least one of the amount of perspiration and the amount of salt loss has changed so as to satisfy a predetermined condition.

Thus, the manager can recognize that the wearer is likely to suffer heat stroke at an early stage. Therefore, the severity of heatstroke is suppressed.

In the heatstroke prevention system 1, the head-mounted device 10 includes an alarm device 12 that gives an alarm to the wearer when at least one of the amount of perspiration and the amount of salt loss has changed and satisfies a predetermined condition.

This enables the wearer to recognize that there is a possibility of heatstroke at an early stage. Therefore, the severity of heatstroke is suppressed.

The moisture replenishment warning system 1 includes a head-mounted device 10 and a management device 91. The head-mounted device 10 includes a communication device 13 that transmits information obtained from the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54 by wireless communication. The management device 91 receives information from the communication device 13, and stores and displays the perspiration amount of the wearer.

Thus, the management device 91 can detect whether or not the wearer located at a remote place needs at least one of water replenishment and salt replenishment. The manager can recognize the need to supply at least one of moisture and salt to the wearer through the management device 91, and can instruct the wearer to supply at least one of moisture and salt or to take a rest. Therefore, the moisture supply warning system 1 can prevent the occurrence of heatstroke due to at least one of a decrease in body moisture and a decrease in body salt content caused by perspiration of the wearer. The moisture replenishment warning system 1 contributes to safe labor management of a wearer wearing the head mounted device 10.

The water replenishment warning system 1 further includes an alarm device 92, and the alarm device 92 gives an alarm to the manager when at least one of the changes in the perspiration amount and the salt loss amount satisfies a predetermined condition.

Thus, the manager can recognize at least one of the need of water replenishment and salt replenishment to the wearer at an early stage. Therefore, it is possible to prevent the occurrence of heatstroke due to at least one of a decrease in body water and a decrease in body salt content caused by sweating of the wearer.

In addition, in the moisture replenishment warning system 1, the head mounted device 10 includes the alarm device 92, and the alarm device 92 gives an alarm to the wearer when the transition of at least one of the perspiration amount and the salt loss amount satisfies a predetermined condition.

Thus, the wearer can recognize at an early stage that at least one of the reduction in body water and the reduction in body salt content due to the perspiration of the wearer is in a state where the wearer needs at least one of the water replenishment and the salt replenishment. This enables the wearer to spontaneously take at least one of water and salt in an appropriate amount, or to take a rest. Therefore, it is possible to prevent the occurrence of heatstroke due to at least one of a decrease in body water and a decrease in body salt content caused by sweating of the wearer. In the moisture replenishment warning system 1, the instruction of at least one of moisture intake and salt intake by the manager using the alarm device 92 and the instruction of at least one of spontaneous moisture intake and salt intake to the wearer using the alarm device 12 may be used in combination.

(modification example)

Fig. 6 is a schematic cross-sectional view showing a modification of the head mounted device. In the head mounted device 10A of the modification, the same reference numerals are given to the same components as those of the head mounted device 10, and the description thereof is omitted, and the different components will be described. The head mounted device 10A of the modification is different from the head mounted device 10 in that it includes the sensor unit 8. The head mounted device 10A of the modification is different from the head mounted device 10 in that the fan 6, the first humidity sensor 52, the second humidity sensor 54, the air volume sensor 56, the environment sensor 58, the salinity sensor 72, the body temperature sensor 74, the heart rate sensor 76, the control device 11, the alarm device 12, the communication device 13, the antenna 14, and the battery 16 are provided in the sensor unit 8. The sensor unit 8 includes a housing 82, a tube member 84, and the subunit 7.

The housing 82 is fitted to the outer surface of the casing 2. The casing 82 has an air inlet 821 through which air is taken in and an air outlet 822 through which air is blown out. The first humidity sensor 52, the environment sensor 58, and the antenna 14 are mounted outside the casing 82 in the vicinity of the inlet 821. Inside the casing 82, the fan 6, the air volume sensor 56, the control device 11, the alarm device 12, the communication device 13, and the battery 16 are mounted. In the modification, the air volume sensor 56 is attached to the outlet of the air of the fan 6. The air volume sensor 56 may be mounted to an air inlet of the fan 6.

One end 841 of tube member 84 is disposed outside E of head mounted device 10A. The other end 842 of the tube member 84 is disposed inside the head mounted device 10A. One end 841 of the tube member 84 is connected to the supply air outlet 822 of the housing 82. The other end 842 of the pipe member 84 is disposed at the lower end of the first flow path 41. A second humidity sensor 54 is attached to the outside of the pipe member 84 in the vicinity of the lower end of the second flow path 42. The other end 842 of the tube member 84 may be disposed at the lower end of the second flow path 42.

The subunit 7 is a plate-like member, for example. On one side of the subunit 7 are fitted a salt concentration sensor 72, a body temperature sensor 74 and a heart rate sensor 76. The subunit 7 is attached to the inner surface of the inner casing 3 such that the surface on which the salt concentration sensor 72, the body temperature sensor 74, and the heart rate sensor 76 are attached is the inside. The subunit 7 is attached to the housing 82. In a modification, the subunit 7 is joined to the housing 82 by a cable 78.

The housing 82 is preferably detachable from the housing 2. The sub-unit 7 is preferably detachable with respect to the inner housing 3. The sensor unit 8 is preferably detachable with respect to the outer case 2 and the inner case 3.

As described above, the head mounted device 10A includes the sensor unit 8. The sensor unit 8 has a housing 82, a pipe member 84, the fan 6, the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54. The pipe member 84 connects upstream ends of the first flow path 41 and the second flow path 42 to the fan 6. The duct member 84, the fan 6, the salinity concentration sensor 72, the first humidity sensor 52, and the second humidity sensor 54 are supported by the housing 82.

Thus, for example, by fitting the sensor unit 8 to the housing 2, the perspiration amount of the wearer's head can be obtained based on the information obtained from the first humidity sensor 52 and the second humidity sensor 54. The head mounted device 10A can more easily measure the physical state of the wearer as the operator, which is necessary for estimating the possibility of heatstroke.

Further, in the head mounted device 10A, the sensor unit 8 is detachable with respect to the housing 2. Therefore, for example, the housing 2 can be cleaned with water or the like.

Description of reference numerals:

1: heatstroke prevention system and water supply warning system

10. 10A: head-mounted device

11: control device

12: alarm device

13: communication device

14: antenna with a shield

16: battery with a battery cell

2: outer casing

20: main body

201: lower end part

202: inner surface

21: brim of hat

211: inner surface

25: cushioning material

250. 251, 252, 253, 254: concave part

3: inner shell

40: spacer member

41: first flow path

42. 421, 422, 423, 424: second flow path

52: first humidity sensor

54: second humidity sensor

56: air quantity sensor

58: environmental sensor

6: fan with cooling device

7: sub-unit

72: salinity concentration sensor

74: body temperature sensor

76: heart rate sensor

78: cable with a protective layer

8: sensor unit

82: shell body

821: air suction inlet

822: air supply outlet

84: pipe component

841: one end of

842: the other end of the tube

9: management section

91: management device

92: alarm device

E: and (3) an external part.